Got the LA Robe. Pretty nice. Not as snug as a knomo probably, there is a bit of room in there on the ends. Not a big deal. The material is very nice...memory foam. Looks good, does the job well, $25. Will try to post pictures.
I returned the bookbook for my MBA 13" because I couldn't get the zipper closed all the way: it fit much too tightly. Maybe I got a defective one based on all of the good opinions here. I might try it again.
I've got a Waterfield sleeve which I use most of the time.